Chuichiro Hattori

Fermion Masses and Mixings in a String Inspired Model

In the context of Calabi-Yau string models we explore the origin of characteristic pattern of quark-lepton masses and the CKM matrix. The discrete

A large Majorana mass from Calabi-Yau superstring models

R

How Can We Obtain a Large Majorana-Mass in Calabi-Yau Models?

-symmetry

Relativistically covariant formulation in non-linear lagrangian theories and factor ordering problems

Z_K \times Z_2

Non-Anomalous Flavor Symmetries and SU(6) ×SU(2)R Model

is introduced and the

The Aligned SU(5) ×U(1)2 Model

Z_2

The String Unification of Gauge Couplings and Gauge Kinetic Mixings

is assigned to the

Maki-Nakagawa-Sakata matrix and Froggatt-Nielsen mechanism

R

Semidirect product gauge group[SU(3)c×SU(2)L]⋊U(1)Yand quantization of hypercharge

-parity. The gauge symmetry at the string scale,

SU(3)L ⋊ (ℤ3 × ℤ3) GAUGE SYMMETRY AND TRI-BIMAXIMAL MIXING

SU(6) \times SU(2)_R